openzeppelin-contracts/docs/modules/api/examples/access-control/MyContractOwnable.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.20;

import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol";

contract MyContract is Ownable {
    constructor(address initialOwner) Ownable(initialOwner) {}

    function normalThing() public {
        // anyone can call this normalThing()
    }

    function specialThing() public onlyOwner {
        // only the owner can call specialThing()!
    }
}